Drill-bit.



No. 715,385. Patented Dec. 9 I902.

" A. s. JONES.

DRILL BIT.

(Application med Feb. 19,1901.

(No Model.)

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AMOS S. JONES, OF CLIFTON, KANSAS.

DRILL-BIT.

SPECIFICATION forming part of Letters Patent No. 715,385, dated December9, 1902.

Application filed February 19, 1901. Serial No. 48.006. (No model) Toall; whom, it may concern:

Be it known that I, Amos S. J owes, a citizen of the UnitedStates,residing at Clifton, in the county 'of Washington and State ofKansas, have invented a new and useful Drill-Bit, of which the followingis a specification.

This invention relates to drill-bits, and more particularly to thatclass of bits used in drilling wells; and the object of the invention isto provide a bit which when reciprocated will be deflected laterallyupon striking the rock or soil and will thus cut a hole of a diametergreater than the greatest width of the blade.

As well drill bits have heretofore been made the hole that is drilled isnot of sufiicient diameter to permit of driving of the casing directlyafter the drill, as the casing that can be fitted into the hole is notof sufficient diameter to permit of withdrawal of the drill through it.With the present construction, however, a hole is drilled or boring ismade the diameter of which is so great that a casing may directly followthe drill and yet be of sufficient diameter to permit of withdrawal ofthe drill therethrough.

In the drawings forming a portion of this specification, and in whichlike numerals of reference indicate similar parts in the several views,Figure 1 is a view showinga portion of a boring as made by the presentbit and showing in section a portion of a casing following the drill,the bit being shown in elevation and the deflected position thereofbeing indicated in dotted lines. Fig. 2 is a detail perspective viewshowing the bit in inverted position. Fig. 3 is a side elevation of thebit.

Referring now to the drawings, the drillbit consists of a body portion 5of cylindrical form, having the usual screw-stem 6 for engagement withthe screwsocket 7 of the drillshaft 8, the lower end of the bit beingflat toned on opposite sides to form the faces 9 and 10. Of theoppositesides 11 and 12 of the bit, between the said faces, the side 12 isstraight and is parallel with the axis of the bit, while the side 11diverges downwardly therefrom at its lower portion and below theshoulders 13 and 14, resulting from the flat- 5o tened portions at 9 and10. The lower portions of the faces 9 and are further cut away to formparallel faces 15 and 16, which are bound ed at their upper ends byshoulders 17 and 18, which result from. this further cutting ofthe bit,and which shoulders lie in a common diagonal plane transversely of thebit and extend from the lower edge of the defiected or diverged side 11to a point spaced upwardly from the lower end of the side 12,

it being understood that the lower end of the bit lies at right anglesto the axis thereof, and this lower edge is provided with the usualdouble bevel to form a chisel edge 19, which is in the same plane withthe lower ends of the shoulders 17 and 18, which also form cutting edgesand lie at right angles to the edge 19.

With this construction it will be seen that as the drill is reciprocatedthe cutting edge 19 cuts the hole, while the edges 20 and 21 at thelower ends of shoulders 17 and 18 also attack the virgin soil or rockand not only assist the edge 19, but urge the drill laterally, so thatit will make a boring greater than its own diameter to permit the casing22 to directly follow the drill. By forming the cutting edges in thesame plane they attack the soil or rock simultaneously, and inconsequence the drill is urged with greater force than if the edges 20and 21 were located higher up on the drill, where they would engage onlythe loose material dislodged by the lower cutting edge 19.

What is claimed is- A drill having a T-shaped entering-point comprisinga chisel and a r'eaming edge terminating in the same plane, the reamingedge being projected laterally beyond one side of the drill-shank, andshoulders extending from the reaming edge obliquely across the drill ongo

